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1//===-- sanitizer_syscall_linux_arm.inc -------------------------*- C++ -*-===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8//9// Implementations of internal_syscall and internal_iserror for Linux/arm.10//11//===----------------------------------------------------------------------===//12 13#define SYSCALL(name) __NR_ ## name14 15static uptr __internal_syscall(u32 nr) {16 register u32 r8 asm("r7") = nr;17 register u32 r0 asm("r0");18 asm volatile("swi #0"19 : "=r"(r0)20 : "r"(r8)21 : "memory", "cc");22 return r0;23}24#define __internal_syscall0(n) \25 (__internal_syscall)(n)26 27static uptr __internal_syscall(u32 nr, u32 arg1) {28 register u32 r8 asm("r7") = nr;29 register u32 r0 asm("r0") = arg1;30 asm volatile("swi #0"31 : "=r"(r0)32 : "r"(r8), "0"(r0)33 : "memory", "cc");34 return r0;35}36#define __internal_syscall1(n, a1) \37 (__internal_syscall)(n, (u32)(a1))38 39static uptr __internal_syscall(u32 nr, u32 arg1, long arg2) {40 register u32 r8 asm("r7") = nr;41 register u32 r0 asm("r0") = arg1;42 register u32 r1 asm("r1") = arg2;43 asm volatile("swi #0"44 : "=r"(r0)45 : "r"(r8), "0"(r0), "r"(r1)46 : "memory", "cc");47 return r0;48}49#define __internal_syscall2(n, a1, a2) \50 (__internal_syscall)(n, (u32)(a1), (long)(a2))51 52static uptr __internal_syscall(u32 nr, u32 arg1, long arg2, long arg3) {53 register u32 r8 asm("r7") = nr;54 register u32 r0 asm("r0") = arg1;55 register u32 r1 asm("r1") = arg2;56 register u32 r2 asm("r2") = arg3;57 asm volatile("swi #0"58 : "=r"(r0)59 : "r"(r8), "0"(r0), "r"(r1), "r"(r2)60 : "memory", "cc");61 return r0;62}63#define __internal_syscall3(n, a1, a2, a3) \64 (__internal_syscall)(n, (u32)(a1), (long)(a2), (long)(a3))65 66static uptr __internal_syscall(u32 nr, u32 arg1, long arg2, long arg3,67 u32 arg4) {68 register u32 r8 asm("r7") = nr;69 register u32 r0 asm("r0") = arg1;70 register u32 r1 asm("r1") = arg2;71 register u32 r2 asm("r2") = arg3;72 register u32 r3 asm("r3") = arg4;73 asm volatile("swi #0"74 : "=r"(r0)75 : "r"(r8), "0"(r0), "r"(r1), "r"(r2), "r"(r3)76 : "memory", "cc");77 return r0;78}79#define __internal_syscall4(n, a1, a2, a3, a4) \80 (__internal_syscall)(n, (u32)(a1), (long)(a2), (long)(a3), (long)(a4))81 82static uptr __internal_syscall(u32 nr, u32 arg1, long arg2, long arg3,83 u32 arg4, long arg5) {84 register u32 r8 asm("r7") = nr;85 register u32 r0 asm("r0") = arg1;86 register u32 r1 asm("r1") = arg2;87 register u32 r2 asm("r2") = arg3;88 register u32 r3 asm("r3") = arg4;89 register u32 r4 asm("r4") = arg5;90 asm volatile("swi #0"91 : "=r"(r0)92 : "r"(r8), "0"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4)93 : "memory", "cc");94 return r0;95}96#define __internal_syscall5(n, a1, a2, a3, a4, a5) \97 (__internal_syscall)(n, (u32)(a1), (long)(a2), (long)(a3), (long)(a4), \98 (u32)(a5))99 100static uptr __internal_syscall(u32 nr, u32 arg1, long arg2, long arg3,101 u32 arg4, long arg5, long arg6) {102 register u32 r8 asm("r7") = nr;103 register u32 r0 asm("r0") = arg1;104 register u32 r1 asm("r1") = arg2;105 register u32 r2 asm("r2") = arg3;106 register u32 r3 asm("r3") = arg4;107 register u32 r4 asm("r4") = arg5;108 register u32 r5 asm("r5") = arg6;109 asm volatile("swi #0"110 : "=r"(r0)111 : "r"(r8), "0"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r5)112 : "memory", "cc");113 return r0;114}115#define __internal_syscall6(n, a1, a2, a3, a4, a5, a6) \116 (__internal_syscall)(n, (u32)(a1), (long)(a2), (long)(a3), (long)(a4), \117 (u32)(a5), (long)(a6))118 119#define __SYSCALL_NARGS_X(a1, a2, a3, a4, a5, a6, a7, a8, n, ...) n120#define __SYSCALL_NARGS(...) \121 __SYSCALL_NARGS_X(__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0, )122#define __SYSCALL_CONCAT_X(a, b) a##b123#define __SYSCALL_CONCAT(a, b) __SYSCALL_CONCAT_X(a, b)124#define __SYSCALL_DISP(b, ...) \125 __SYSCALL_CONCAT(b, __SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__)126 127#define internal_syscall(...) __SYSCALL_DISP(__internal_syscall, __VA_ARGS__)128 129// Helper function used to avoid cobbler errno.130bool internal_iserror(uptr retval, int *rverrno) {131 if (retval >= (uptr)-4095) {132 if (rverrno)133 *rverrno = -retval;134 return true;135 }136 return false;137}138